Question

Design an Essay class that extends the GradedActivity class presented in the chapter 10 of textbook. The Essay class should determine the grade a student receives for an essay. The student’s essay score can be up to 100 and is determined in the following manner:
 Grammar: 30 points

 Spelling: 20 points

 Correct length: 20 points

 Content: 30 points
Demonstrate the class in a simple program.

Example Run
run:

Term paper:

Grammar points: 25.0

Spelling points: 18.0

Length points: 20.0

Content points: 25.0

Total points: 88.0

Grade: B

Answer 1

C++ Program:

#include <iostream>

using namespace std;

/* Class already present in the chapter */
class GradedActivity
{
protected:
double score; // To hold the numeric score
public:
// Default constructor
GradedActivity()
{ score = 0.0; }

// Constructor
GradedActivity(double s)
{ score = s; }

// Mutator function
void setScore(double s)
{ score = s; }

// Accessor functions
virtual double getScore() const
{ return score; }

virtual char getLetterGrade() const;
};

char GradedActivity::getLetterGrade() const
{
char letterGrade; // To hold the letter grade

if (score > 89)
letterGrade = 'A';
else if (score > 79)
letterGrade = 'B';
else if (score > 69)
letterGrade = 'C';
else if (score > 59)
letterGrade = 'D';
else
letterGrade = 'F';

return letterGrade;
}

/* Essay class */
class Essay : public GradedActivity
{
   private:
       double grammerPts;
       double spellingPts;
       double lengthPts;
       double contentPts;

   public:
       // Default constructor
       Essay()
       {
           grammerPts = 0.0;
           spellingPts = 0.0;
           lengthPts = 0.0;
           contentPts = 0.0;
       }

       // Setter Methods
       void setGrammerPts(double pts)
       {
           // Validating points.
           if (pts < 0 || pts > 30)
           {
               // Invalid data
               cout << "\n Error!!! Not a valid value... \n";

               //Set value to 0
               grammerPts = 0;
           }
           else
           {
               // Assigning Value
               grammerPts = pts;
           }
       };

       void setSpellingPts(double pts)
       {
           // Validating points.
           if (pts < 0 || pts > 20)
           {
               // Invalid data
               cout << "\n Error!!! Not a valid value... \n";

               //Set value to 0
               spellingPts = 0;
           }
           else
           {
               // Assigning Value
               spellingPts = pts;
           }
       };

       void setLengthPts(double pts)
       {
           // Validating points.
           if (pts < 0 || pts > 20)
           {
               // Invalid data
               cout << "\n Error!!! Not a valid value... \n";

               //Set value to 0
               lengthPts = 0;
           }
           else
           {
               // Assigning Value
               lengthPts = pts;
           }
       };

       void setContentPts(double pts)
       {
           // Validating points.
           if (pts < 0 || pts > 30)
           {
               // Invalid data
               cout << "\n Error!!! Not a valid value... \n";

               //Set value to 0
               contentPts = 0;
           }
           else
           {
               // Assigning Value
               contentPts = pts;
           }
       };

       //Overriding setScore function
       void setScore()
       {
            GradedActivity::setScore(grammerPts + spellingPts + lengthPts + contentPts);
       }

       // Getter Methods
       double getGrammerPts(){ return grammerPts; }
       double getSpellingPts(){ return spellingPts; }
       double getLengthPts(){ return lengthPts; }
       double getContentPts(){ return contentPts; }
};

// Test Program
int main()
{
    Essay essayObj;
    double pts;

    // Reading Grammar Points
    cout << "\n Input grammar points(0-30): ";
    cin >> pts;

    //Storing using Essay class object
    essayObj.setGrammerPts(pts);

    // Reading Spelling Points
    cout << "\n Input spelling points(0-20): ";
    cin >> pts;

    //Storing using Essay class object
    essayObj.setSpellingPts(pts);

    // Reading Length Points
    cout << "\n Input correct length points(0-20): ";
    cin >> pts;

    //Storing using Essay class object
    essayObj.setLengthPts(pts);

    // Reading Content Points
    cout << "\n Input content points(0-30): ";
    cin >> pts;

    //Storing using Essay class object
    essayObj.setContentPts(pts);

    //Assigning total score
    essayObj.setScore();

    // Displaying results
    cout << "\n\n Total score: " << essayObj.getScore() << endl;
    cout << "\n\n Grade Obtained: " << essayObj.getLetterGrade() << endl;

    cout << "\n\n";
    return 0;